From: Carlo Caione <carlo@xxxxxxxxxx>
Bindings documentation for the AXP20x driver. In this file also
sub-nodes are documented.
Signed-off-by: Carlo Caione <carlo@xxxxxxxxxx>
Acked-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
[wens@xxxxxxxx: clarify interrupt source for the axp PMIC]
[wens@xxxxxxxx: explain dcdc-workmode in detail and trim lines to 80 chars]
[wens@xxxxxxxx: make regulator supplies optional if using unregulated input]
[wens@xxxxxxxx: use cubieboard2 regulator nodes as example]
[wens@xxxxxxxx: change dcdc-workmode to dcdc-workmode-pwm boolean property]
[wens@xxxxxxxx: use clock-frequency for dcdc regulator work frequency]
Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
---
Documentation/devicetree/bindings/mfd/axp20x.txt | 102 +++++++++++++++++++++++
1 file changed, 102 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/axp20x.txt
diff --git a/Documentation/devicetree/bindings/mfd/axp20x.txt b/Documentation/devicetree/bindings/mfd/axp20x.txt
new file mode 100644
index 000000000000..c3c80db242c7
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/axp20x.txt
@@ -0,0 +1,102 @@
+AXP202/AXP209 device tree bindings
+
+The axp20x family current members :
+axp202 (X-Powers)
+axp209 (X-Powers)
+
+Required properties:
+- compatible: "x-powers,axp202" or "x-powers,axp209"
+- reg: The I2C slave address for the AXP chip
+- interrupt-parent: The parent interrupt controller
+- interrupts: SoC NMI / GPIO interrupt connected to the PMIC's IRQ pin
+- interrupt-controller: axp20x has its own internal IRQs
+- #interrupt-cells: Should be set to 1
+- regulators: A node that houses a sub-node for each regulator. The regulators
+ are bound using their name as listed here: dcdc2, dcdc3, ldo1,
+ ldo2, ldo3, ldo4, ldo5. The bindings details of individual
+ regulator device can be found in:
+ Documentation/devicetree/bindings/regulator/regulator.txt with
+ the exception of x-powers,dcdc-freq. Regulators not used should
+ still be listed for completeness and that the regulator subsystem
+ properly registers them.
+
+Optional properties:
+- regulator supplies - may be omitted if inputs are unregulated, such as using
+ the IPSOUT output from the PMIC
+ - acin-supply: The input supply for LDO1
+ - vin2-supply: The input supply for DCDC2
+ - vin3-supply: The input supply for DCDC3
+ - ldo24in-supply: The input supply for LDO2, LDO4
+ - ldo3in-supply: The input supply for LDO3
+ - ldo5in-supply: The input supply for LDO5
+
+Optional properties for regulators node:
+- clock-frequency: defines the work frequency of DC-DC regulators
+ (range: 750kHz - 1875kHz). Default: 1.5MHz
+
+Optional properties for DCDC regulators:
+- x-powers,dcdc-workmode-pwm: Force the DCDC regulators to run in PWM mode
+ The DCDC regulators rormally work in a mixed
+ PWM/PFM mode, using PFM under light loads and
+ switching to PWM for heavier loads. Forcing
+ PWM mode trades efficiency under light loads
+ for lower output noise. This probably makes
+ sense for HiFi audio related applications that
+ aren't battery constrained.
+
+Example:
+
+axp209: pmic@34 {
+ compatible = "x-powers,axp209";
+ reg = <0x34>;
+ interrupt-parent = <&nmi_intc>;
+ interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+ interrupt-controller;
+ #interrupt-cells = <1>;
+
+ regulators {
+ clock-frequency = <1500000>;
+
+ vdd_cpu: dcdc2 {
+ regulator-always-on;
+ regulator-min-microvolt = <1000000>;
+ regulator-max-microvolt = <1450000>;
+ regulator-name = "vdd-cpu";
+ };
+
+ vdd_int_dll: dcdc3 {
+ regulator-always-on;
+ regulator-min-microvolt = <1000000>;
+ regulator-max-microvolt = <1400000>;
+ regulator-name = "vdd-int-dll";
+ };
+
+ vdd_rtc: ldo1 {
+ regulator-always-on;
+ regulator-min-microvolt = <1200000>;
+ regulator-max-microvolt = <1400000>;
+ regulator-name = "vdd-rtc";
+ };
+
+ avcc: ldo2 {
+ regulator-always-on;
+ regulator-min-microvolt = <2700000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-name = "avcc";
+ };
+
+ ldo3 {
+ /* unused */
+ };
+
+ csi1_io_2v8: ldo4 {
+ /* output on extension headers */
+ regulator-name = "csi1-io-2v8";
+ };
+
+ ldo5 {
+ /* unused */
+ };
+ };
+};
+
--
2.1.4
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